<template>
  <div>
    <!-- 评论列表 -->
    <van-list class="cmt-list_container" v-model="loading" :finished="done" :immediate-check="false" offset="50" finished-text="没有更多了" @load="pullUpLoadMoreFn">
      <div class="cmt-list">
      <!-- 评论的 Item 项 -->
      <div class="cmt-item" v-for="obj in commentList" :key="obj.com_id">
        <!-- 头部区域 -->
        <div class="cmt-header">
          <!-- 头部左侧 -->
          <div class="cmt-header-left">
            <img :src="obj.aut_photo" alt="avatar" class="avatar" />
            <span class="uname">{{ obj.aut_name }}</span>
          </div>
          <!-- 头部右侧 -->
          <div class="cmt-header-right">
            <van-icon
              v-if="obj.is_liking"
              @click="likeOrDislikeCommentFn(obj)"
              name="like"
              size="16"
              color="red"
            />
            <van-icon
              v-else
              @click="likeOrDislikeCommentFn(obj)"
              name="like-o"
              size="16"
              color="gray"
            />
          </div>
        </div>
        <!-- 主体区域 -->
        <div class="cmt-body" v-html="obj.content"></div>
        <!-- 尾部区域 -->
        <div class="cmt-footer">{{ formatTimeAgoFn(obj.pubdate) }}</div>
      </div>
    </div>
    </van-list>

    <!-- 底部添加评论区域 - 1 -->
    <div v-if="isShowCmtTop" class="add-cmt-box van-hairline--top">
      <van-icon name="arrow-left" size="0.48rem" @click="$router.back()" />
      <div class="ipt-cmt-div" @click="isShowCmtTop = false">发表评论</div>
      <div class="icon-box">
        <van-badge
          :content="totalCount"
          :max="99"
          @click.native="scrolToViewFn"
        >
          <van-icon name="comment-o" size="0.53333334rem" />
        </van-badge>
        <van-icon v-if="artObj.is_collected" @click="toggleCollectFn" name="star" size="0.53333334rem" />
        <van-icon  v-else @click="toggleCollectFn" name="star-o" size="0.53333334rem" />
        <van-icon name="share-o" size="0.53333334rem" />
      </div>
    </div>

    <!-- 底部添加评论区域 - 2 -->
    <div v-else class="cmt-box van-hairline--top">
      <textarea
        v-model.trim="cmtStr"
        placeholder="友善评论、理性发言、阳光心灵"
        v-foc
        @blur="blurFn"
        @keydown.enter="publishCmtFn"
      ></textarea>
      <van-button type="default" :disabled="!cmtStr"  @click="publishCmtFn"
        >发布</van-button
      >
    </div>
  </div>
</template>

<script>
import { getCommentListAPI, likeCmtAPI, dislikeCmtAPI, publishCmtAPI } from '@/api/article'
import { Toast } from 'vant'
export default {
  name: 'Comment',
  props: {

    artObj: {
      type: Object,
      required: true
    }
  },
  data () {
    return {
      commentList: [], // 评论列表
      isShowCmtTop: true, // 控制评论两套标签的互斥显示
      totalCount: 0, // 评论的总数
      cmtStr: '', // 评论的内容
      loading: false,
      done: false
    }
  },
  created () {
    this.getCommentList()
  },
  methods: {
    // 红心点赞
    async likeOrDislikeCommentFn (item) {
      // 同步到后台
      try {
        item.is_liking
          ? await dislikeCmtAPI({
            cmtId: item.com_id
          })
          : await likeCmtAPI({
            cmtId: item.com_id
          })
        Toast.success(item.is_liking ? '取消点赞成功' : '点赞成功')
        item.is_liking = !item.is_liking
      } catch (e) {
        Toast.fail(item.is_liking ? '取消点赞失败' : '点赞失败')
      }
    },
    scrolToViewFn () {
      document.getElementById('like-box').scrollIntoView({
        behavior: 'smooth'
      })
    },
    // 失去焦点
    blurFn () {
      setTimeout(() => {
        this.isShowCmtTop = true
      })
    },
    async publishCmtFn () {
      try {
        // 同步到后台
        const resp = await publishCmtAPI({
          artId: this.artObj.art_id,
          data: this.cmtStr
        })
        // 把评论内容添加到数组头部
        this.commentList.unshift(resp.data.new_obj)
        this.cmtStr = ''
        Toast.success('发布成功')
      } catch (e) {
        Toast.fail('发布失败')
      }
    },
    // 封装 获取评论列表
    async getCommentList () {
      const resp = await getCommentListAPI({
        artId: this.artObj.art_id,
        offset: this.offset
      })
      const { results, total_count: totalCount, last_id: lastId } = resp.data
      if (lastId === null || results.length < 10) {
        this.done = true
        return
      }
      this.offset = lastId
      this.commentList = [...this.commentList, ...results]
      this.totalCount = totalCount || ''
      this.loading = false
    // console.log(resp)
    },
    // 上拉加载更多
    pullUpLoadMoreFn () {
      this.getCommentList()
    },
    // 收藏
    toggleCollectFn () {
      this.artObj.is_collected = !this.artObj.is_collected
    }
  }
}
</script>

<style scoped lang="less">
.cmt-list_container{
  padding-bottom: 46px;
}
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}
/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 46px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>
